BitNami JRubyStack provides a fast, easy way to
develop and deploy Ruby on Rails applications on a
Java runtime using JRuby. It includes JRuby,
Rails, Java, Tomcat, the GlassFish gem, MySQL, and
Subversion. It supports Windows, Linux, and Mac OS
X, so you can share the same Rails environment on
multiple platforms.

Event Calendar started as a replacement for an antiquated script to generate meeting invites with attached ical. It has since grown to be a full fledged event calendar system for public events. Important to Event Calendar is the theory of multiple interfaces, where any data in the system should be accessible in a multitude of ways. For events, this means via nice HTML, iCal, XML, and JSON. Event Calendar also includes integration with Google Maps for directions to event locations.

MoodTrack is a record of observations, events, notes, medications, and doctors that describe a patient. Metrics can be defined to measure the patient's mood, behavior, or other aspects of interest. Caregivers may export the data and send it to medical professionals who have a copy of MoodTrack, and they can import it and then review it to decide if a change in medication or treatment is required. It is not meant to take the place of visits to the doctor, but rather to increase the amount of information available to the doctor.

leihs is a Web-based inventory management/equipment booking system with a focus on borrowing/lending. It is best suited for universities or colleges that have large equipment pools, e.g. art universities with film-making equipment.

Crabgrass is social networking, group collaboration, and network organizing Web application. It consists of a solid suite of group collaboration tools such as private wikis, task lists, a file repository, and decision making tools. Work is currently being done on a large user interface overhaul, better social networking tools, blogs, and event calendars, as well as better support for collaboration and decision making among independent groups.

Karma is a Web service provider for tracking "karma" points of users who are distributed across several separate Web applications. It is useful for when sites want to allow community contributions to content, but certain higher types of content should only be able to be submitted by people who have demonstrated the ability to contribute value at lower levels. The vision is to create a generic karma service where a central server instance provides its services to several related Web applications. Those applications are the clients of the karma server instance. They can quickly and securely submit and retrieve karma for their users.

Shapado is a multi-topic and multi-language question-and-answer Web site service à la StackOverFlow where users can vote on questions and answers and receive karma. Unlike StackOverFlow, people can ask questions on various topic by picking a category (science, programming, business, politics, etc.). It is also possible to subscribe to categories or groups of categories.

CRUD through HTTP is a good step forward to using resources and becoming RESTful. Another step further into it is to make use of hypermedia-based services and the Restfulie gem allows you to do it very quickly.

Noosfero is a Web platform for social networks. Besides the regular social network features (such as friends and communities), Noosfero offers a full-featured CMS, making every user or community profile a complete Web site with several types of content (including text, image gallery, and file uploads), RSS feeds, agenda, the possibility to set custom themes, and other features. It is also possible to run several independent social networks within the same Noosfero installation.